Unbeknownst means that you don't know about something. You might say something is unbeknownst to you, or that someone is unbeknownst to you.
The detective was trying to track down the killer, but he was unbeknownst to the victim.
The manager was trying to find out who was leaking information to the press, but he was unbeknownst to the employees.
adverb
without someone's knowledge
Synonyms:
adjective
(usually used with `to') occurring or existing without the knowledge of
Synonyms:
1
Apparently unbeknownst to McShane, the College Republicans had already decided to rescind the invitation.
2
Unbeknownst to everyone in modern times.
3
Unbeknownst to them, it's all a trap.
4
Fifth, collecting data unbeknownst to the user.
5
Unbeknownst by most, he's controversial figure.
6
Unbeknownst to him she is the daughter of the widow.
7
Unbeknownst to the government, the device was inherently unstable.
8
Unbeknownst to the humans this invoked the wrath of the hydrogues.
9
Unbeknownst to the public, however, recent scholarship.
10
Owen planned a wedding for Jackie unbeknownst to Bridget.